US3955048A - Scanning method and apparatus - Google Patents

Scanning method and apparatus Download PDF

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Publication number
US3955048A
US3955048A US05/499,996 US49999674A US3955048A US 3955048 A US3955048 A US 3955048A US 49999674 A US49999674 A US 49999674A US 3955048 A US3955048 A US 3955048A
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US
United States
Prior art keywords
scanning
reflecting means
common area
rotating reflecting
light beams
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/499,996
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English (en)
Inventor
Minoru Tanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Application granted granted Critical
Publication of US3955048A publication Critical patent/US3955048A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
    • H04N1/1135—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors for the main-scan only

Definitions

  • the present invention relates to a scanning method and apparatus which, for example, may be used in the transmitter and/or receiver of a facsimile system or in an electrographic copier.
  • a main scan is generally effected by the rocking of reflector while a subsidiary scan is effected by movement of the document (zinc oxide paper or some other recording paper) past the scanning reflector.
  • a subsidiary scan is effected by movement of the document (zinc oxide paper or some other recording paper) past the scanning reflector.
  • a reflector is continuously rotated in the same direction.
  • a mirror drum having a multi-face mirror rotor is used.
  • these methods also have problems with respect to scanning speed or displacement of the main optical axis.
  • a primary object of this invention is to provide an improved scanning method and apparatus where the displacement of the main optical axis found in multi-face mirror rotor scanners is minimized and increased scanning speed is obtained.
  • FIG. 1 is a schematic drawing of an illustrative embodiment of the invention.
  • FIG. 2 is a partially broken, enlarged perspective view of a portion of the FIG. 1 embodiment.
  • FIG. 1 is a schematic illustration of an embodiment of the invention wherein a scanning device according to the invention may be utilized at the receiver side of a facsimile system.
  • a light source 1 such as a laser has an optical axis 2.
  • Provided on said optical axis 2 are n sheets of scanning beam dividing semitransparent mirrors 3 1 , 3 2 . . .3 k . . .3 n .
  • Mirror 3 n may be a reflector only.
  • each rotary reflection means 6 1 , 6 2 . . .6 k . . .6 n are provided on each reflection optical axis 7 1 , 7 2 . . .7 k . . .7 n of the scanning beam dividing semitransparent mirrors.
  • each rotary reflection means 6 k reflects the divided scanning beam from scanning beam dividing semitransparent mirror 3 k in the two directions A k and B k by semitransparent mirror 4 k and reflector 5 k .
  • Attenuators 11 k adjust the reflected light volume from rotary reflection means 6 k where the attenuators may comprise filters made of glass or gelatin containing appropriate absorption material or a pair of polarizer plates.
  • Semitransparent mirrors 9 1 , 9 2 . . .9 k . . .9 n direct reflected light from rotary reflecting means 6 1 , 6 2 . . .6 k . . .6 n to a moving document 10 such as a zinc oxide paper or other recording paper.
  • Each rotary reflection means 6 1 , 6 2 . . .6 k . . .6 n is rotated at the same speed by a driving means 8.
  • the semitransparent mirror 4, of rotary reflection means 6 1 is so positioned that it scans the input beam thereto along a stationary semitransparent mirror 9 1 prior to the scanning of a stationary semitransparent mirror 9 2 by the beam applied to a semitransparent mirror 4 2 of rotary reflecting means 6 2 .
  • the semitransparent mirror 4 1 of rotary reflecting means 6 1 is angularly positioned in front of semitransparent mirror 4 2 of rotary reflecting means 6 2 .
  • the angular difference between the positions of semitransparent mirrors 4 1 and 4 2 would be 60°.
  • semitransparent mirrors 9 1 , 9 2 . . .9 k . . .9 n are disposed in front of one another while the rotary reflecting means 6 1 , 6 2 . . .6 k . . .6 n are so disposed with respect to one another that the output beams therefrom respectively scan semitransparent mirrors 9 1 , 9 2 . . .9 k . . .9 n .
  • the output beam A 1 will scan mirror 9 1 as rotary reflecting means 6 1 rotates from the position shown in FIG. 1.
  • a 1 beam scans mirror 9 1 it is reflected therefrom and transmitted through mirrors 9 2 through 9 n where it scans a common area extending from P to P'.
  • the moving document 10 will be in the position shown in FIG. 1, and thus the portion thereof underneath common area P-P' is scanned at this time.
  • beam A 2 starts scanning mirror 9 2 since mirror 4 2 has now been rotated to a position where output beam A 2 is directed at one end of mirror 9 2 .
  • beam A 2 scans mirror 9 2 from whence it is reflected through mirrors 9 3 (not shown). . .9 k . . .9 n to scan common area P-P'.
  • a different portion of moving document 10 is under common area P-P' so that this new portion of document 10 is scanned.
  • each beam A 1 , A 2 etc. is effective for purposes of scanning document 10 for an angular rotation of rotary reflecting means 6 1 ,6 2 . . .6 k . . .6 n of 360/2n°, the difference in the angular orientation of each scanning mirror 4 1 ,4 2 . . .4 k . . .4 n with respect to the mirrors adjacent thereto.
  • the scanning method and apparatus of this invention divide the scanning beam from source 1 into plural beam lines and continuous scanning of the common scanning area P-P' is successively effected by the divided scanning beams.
  • the scanning speed can be increased with minimal mechanical vibration or main optical axis displacement.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Mechanical Optical Scanning Systems (AREA)
US05/499,996 1973-08-30 1974-08-23 Scanning method and apparatus Expired - Lifetime US3955048A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JA48-96660 1973-08-30
JP9666073A JPS5328100B2 (enrdf_load_stackoverflow) 1973-08-30 1973-08-30

Publications (1)

Publication Number Publication Date
US3955048A true US3955048A (en) 1976-05-04

Family

ID=14170968

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/499,996 Expired - Lifetime US3955048A (en) 1973-08-30 1974-08-23 Scanning method and apparatus

Country Status (3)

Country Link
US (1) US3955048A (enrdf_load_stackoverflow)
JP (1) JPS5328100B2 (enrdf_load_stackoverflow)
GB (1) GB1453164A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2581251A1 (fr) * 1985-04-30 1986-10-31 Thomson Csf Dispositif d'aboutement optique de detecteurs photosensibles
US6141118A (en) * 1996-06-13 2000-10-31 Canon Kabushiki Kaisha Optical scanning device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3064077A (en) * 1959-01-29 1962-11-13 Technitrol Inc Indicia transfer system
US3646568A (en) * 1969-04-03 1972-02-29 Rca Corp Beam control system
US3668409A (en) * 1971-02-26 1972-06-06 Computer Indentics Corp Scanner/decoder multiplex system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3064077A (en) * 1959-01-29 1962-11-13 Technitrol Inc Indicia transfer system
US3646568A (en) * 1969-04-03 1972-02-29 Rca Corp Beam control system
US3668409A (en) * 1971-02-26 1972-06-06 Computer Indentics Corp Scanner/decoder multiplex system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2581251A1 (fr) * 1985-04-30 1986-10-31 Thomson Csf Dispositif d'aboutement optique de detecteurs photosensibles
EP0201396A1 (fr) * 1985-04-30 1986-12-17 Thomson-Csf Dispositif d'aboutement optique de détecteurs photosensibles
US6141118A (en) * 1996-06-13 2000-10-31 Canon Kabushiki Kaisha Optical scanning device

Also Published As

Publication number Publication date
GB1453164A (en) 1976-10-20
JPS5046342A (enrdf_load_stackoverflow) 1975-04-25
JPS5328100B2 (enrdf_load_stackoverflow) 1978-08-12

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